Do your config files read better as YAML than as JSON? Many tools like Docker Compose, Ansible, and Kubernetes prefer YAML. This JSON to YAML converter rewrites your JSON data as indented YAML in the browser.
It is built for developers, DevOps engineers, and technical writers. You paste JSON on the left, and the YAML appears on the right as you type. Nothing is sent to a server.
Table of Contents
- What the Converter Does
- How to Use It, Step by Step
- How the Conversion Works
- Worked Example
- How to Read the Results
- Strings, Numbers, and Round Trips
- Limitations and Assumptions
- FAQs About the JSON to YAML
What the Converter Does
The tool reads valid JSON and prints the same data in YAML form. It runs on one input box, one output box, and two buttons.
- Raw JSON Input: the box where you paste or type JSON. It starts with a sample object.
- Converted YAML Output: a read only box that fills in as you type. You cannot edit it directly.
- JSON Size: the size of your input in bytes, counted as UTF-8.
- YAML Lines: the number of visible lines in the output text.
- Status: a label that reads Converted, Invalid, or No input.
- Clear empties the input, and Copy YAML copies the output to your clipboard.
How to Use It, Step by Step
- Open the converter and look at the Raw JSON Input box.
- Delete the sample, then paste your own JSON object or array.
- Watch the Converted YAML Output box update as you type.
- Check the JSON Size and YAML Lines cards for a quick size read.
- Press Copy YAML to send the result to your clipboard.
- Press Clear to empty the input and start over.
How the Conversion Works
The tool first parses your text with the browser JSON reader. If that fails, it shows an error message and marks the Status as Invalid.
When the JSON is valid, the tool walks the data. Object keys become key: value lines. Array items become lines that start with a dash. Each nested level adds two spaces of indent.
JSON Objecttokey: value lines+2 spaces per level=Indented YAML
The tool quotes a string when a YAML reader could misread it. Plain text like a name stays bare, so most values look clean.
Worked Example
Here is the sample that loads by default. Priya pastes a small config object and reads the YAML on the right.
| JSON Input | YAML Output |
|---|
| "name": "ToolSuite" | name: ToolSuite |
| "version": 1.0 | version: 1 |
| "settings": { ... } | settings: |
| "theme": "light" | theme: light |
| "autoSave": true | autoSave: true |
| "tags": ["utility", ...] | tags: |
| first tag | - utility |
Notice version: 1 in the output. The input was 1.0, but JSON stores that as the number 1, so the trailing zero is lost. The JSON Size card reads 150 B for this sample, and YAML Lines reads 9.
How to Read the Results
Converted YAML Output holds the full result. Select it or use the copy button, since the box itself is read only.
JSON Size counts the bytes in your input as UTF-8. Plain English text uses one byte per letter, while accented or emoji characters use more.
YAML Lines counts the visible lines in the output. The tool trims the final line break first, so the number matches what you see.
Status reports the state of the last parse. It reads Converted on success, Invalid when the JSON is broken, and No input when the box is empty.
Strings, Numbers, and Round Trips
YAML reads some bare words as special values. The word yes can become true, and a leading zero can be dropped from a number.
To keep your data safe, this tool wraps any risky string in quotes. A ZIP code like "02139" prints as '02139', and a value like "yes" prints as 'yes'. Text with a colon, such as "a: b", also gets quotes so the line stays valid.
That makes the output a type-safe round trip for most data. If you want to confirm the result, check it in a YAML syntax validator first. To reverse the process, the YAML to JSON converter turns YAML back into JSON.
Clean input helps a lot. Run messy data through a JSON formatter to indent it, or confirm it with a JSON validator before you convert.
Limitations and Assumptions
- Numbers pass through the browser JSON reader first. A value like 1.0 becomes 1, and very large integers can lose their last digits.
- Multi line text is emitted as one quoted line with escape codes. It reloads to the same string but is not a YAML block scalar.
- The output follows two space indent and basic YAML style. It does not offer tabs, flow style, or custom spacing.
- The input must be valid JSON. The tool does not repair trailing commas or single quotes for you.
- The output box is read only, so edits must happen in the input or after you copy the text.
For other formats, the JSON to CSV converter handles flat tables. You can browse more options in the developer tools hub.
FAQs About the JSON to YAML
Does This Tool Send My JSON to a Server?
No. The conversion runs in your browser with local code. Your data stays on your device, which is helpful for private config files.
What Happens if My JSON Is Not Valid?
The output box shows a short error that starts with Invalid JSON input. The Status card turns to Invalid and an alert names the bad field.
Can I Convert a Plain String or Number by Itself?
Yes. A lone value such as 42 or "hello" now prints as its own scalar line. You are not limited to objects and arrays.
Can I Convert a JSON Array and Not Just an Object?
Yes. A top level array prints as a list of dash lines. An array of objects places the first key on the dash line.
What Does an Empty List or Object Look Like?
An empty array prints as key: [] and an empty object prints as key: {}. Both reload to an empty value, not to null.
Does the Copy Button Work on Every Page?
Copy uses the browser clipboard when it is allowed. If that path is blocked, the tool falls back to a manual copy and tells you if it fails.
This calculator gives general estimates only and is not professional advice. Reviewed for general accuracy by Prof. Dr. Khalil Mudassar, PhD.